INRAE, Univ. Bordeaux, UMR BFP, 33140, Villenave d'Ornon, France.
INRAE, UR ASTRO, 97170, Petit-Bourg, Guadeloupe, France.
Arch Virol. 2020 Nov;165(11):2653-2657. doi: 10.1007/s00705-020-04787-0. Epub 2020 Aug 27.
A novel virus infecting yams (Dioscorea spp.), tentatively named "yam asymptomatic virus 1" (YaV1), was characterized and sequenced from an asymptomatic D. alata plant from Vanuatu. Sequence comparisons and phylogenetic analysis showed that YaV1 is a novel ampelovirus and has the smallest genome among "subgroup 1" members. RT-PCR-based screening of a yam germplasm collection conserved in Guadeloupe showed that YaV1 is prevalent in D. alata, D. bulbifera, D. cayennensis subsp. rotundata, D. esculenta and D. trifida accessions but causes no apparent symptoms. Additional phylogenetic analysis revealed a low variability of YaV1 in Guadeloupe in a limited part of the genome, and suggested the occurrence of plant-to-plant transmission.
一种感染山药（薯蓣属）的新型病毒，暂命名为“山药无症状病毒 1 号”（YaV1），从瓦努阿图一株无症状的大薯植株中被分离和测序。序列比较和系统进化分析表明，YaV1 是一种新型的马铃薯 Y 病毒科病毒，是“第 1 亚组”成员中基因组最小的病毒。基于 RT-PCR 的对保存在瓜德罗普岛的山药种质资源的筛选表明，YaV1 在大薯、薯蓣、薯蓣 Cayennensis 亚种、参薯和盾叶薯蓣中普遍存在，但不会引起明显的症状。进一步的系统进化分析显示，YaV1 在瓜德罗普岛的基因组有限部分的变异性较低，表明存在植株间的传播。
